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Intelligent tolerance grade design method based on Ontology

A technology of tolerance level and design method, applied in the direction of configuration CAD, geometric CAD, etc., can solve the problem of difficult intelligentization of tolerance level, achieve clear hierarchical relationship, ensure portability, and ensure scalability

Pending Publication Date: 2022-01-14
GUILIN UNIV OF ELECTRONIC TECH
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Problems solved by technology

[0005] The technical problem to be solved in the present invention is that the design of the existing tolerance level is difficult to be intelligent, and a method for intelligent design of tolerance level based on Ontology is proposed

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  • Intelligent tolerance grade design method based on Ontology
  • Intelligent tolerance grade design method based on Ontology
  • Intelligent tolerance grade design method based on Ontology

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Embodiment Construction

[0027] The following is a brief description of the transmission as an example, as attached Figure 5 shown. Since the bearing is a standard part, in order to reduce the complexity, the present invention does not consider the tolerance and matching requirements between its internal components. The steps to generate the tolerance grade of each part of the transmission are as follows:

[0028] Step A: Construct the tolerance level intelligent design ontology, first define the relationship between classes. According to the representation model, the terms of the unary relationship are defined as classes, specifically: Ass (assembly), Part (part), FF (fit element), and TG (tolerance level) subclasses include CON (tolerance level selection constraint), App (application of tolerance level) and MM (processing method); the subcategories of FT (fit type) include CF, TF and IF (clearance, excessive, interference fit); CON (constraint) has 5 types according to fuzzy theory requirements; ...

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Abstract

The invention belongs to the technical field of fitting tolerance specification design and computer aided tolerance design (CAT), and particularly relates to an intelligent tolerance grade design method based on Ontology. The method specifically comprises the following steps: (1) constructing a tolerance grade ontology; (2) based on a fuzzy comprehensive evaluation principle, establishing an SWRL inference rule of a tolerance grade specification; (3) extracting related tolerance information of the tolerance grade of a part; (4) constructing a tolerance grade instantiation ontology model; and (5) in combination with a Jess inference engine with the SWRL rule, inferring the tolerance grade and outputting a result. The method constructs an ontology reasoning knowledge framework for the tolerance grade domain knowledge by using the ontology, reasons implicit knowledge according to dominant domain knowledge to expand a tolerance grade knowledge base, and in combination with a semantic network rule language rule base, reasons the design of the tolerance grade according to the specific design of a geometric product and the use environment condition. According to the method, a consistency knowledge description framework of the tolerance grade can be provided, so that a computer can automatically select a proper tolerance grade according to the shape and size parameters of the geometric product, and the tolerance grade range is preferably selected. A fast and effective method is provided for the intelligent design of the tolerance grade.

Description

technical field [0001] The invention relates to the field of assembly tolerance specification and the technical field of computer-aided tolerance design (CAT), in particular to an intelligent design method of tolerance levels based on Ontology. Background technique [0002] In tolerance design, one of the key technologies is the problem of tolerance fit, and the key point of tolerance fit lies in the selection of tolerance grades. The essence of selecting the tolerance level is to correctly solve the contradiction between the use requirements of machine parts and the manufacturing process and cost. It is to choose the lower tolerance level as much as possible under the premise of meeting the use requirements of the parts. Accuracy requirements should be coordinated with the possibility of production, that is, reasonable processing technology, assembly technology and existing equipment should be adopted. However, if necessary, methods of improving equipment accuracy and imp...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F30/10G06F111/20
CPCG06F30/10G06F2111/20
Inventor 黄美发李健罗民宏唐哲敏
Owner GUILIN UNIV OF ELECTRONIC TECH
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